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Radio
Broadcast Technical Consulting and Sales |
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KBUN
AM |
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Facility Upgrade |
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Back to the KBUN/KBHP/KKZY/KLLZ/WQXJ page
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To the
KBUN/KBHP/KKZY studio project
 To the KBHP/KKZY transmitter project |
To the
Blackduck transmitter project KBUN Water Tower |
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September 2010: It was time to upgrade old wiring and an old transmitter to a new setup at KBUN AM Radio in Bemidji, Minnesota. Yes, he is wearing ear plugs while operating the hammer drill. |
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The work involved having an electrician come in to install new electrical wiring and drill holes through concrete walls with a hammer drill. Things really go well when the right tools are available. |
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A fluorescent lamp fixture on the ceiling had to be moved to a new location. The original bolts in the concrete ceiling were frozen in place so some had to be removed with a hand-grinder. |
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Three-inch
copper strap was run across the ceiling and into two equipment racks.
Quote of the day: You can never have too much grounding. |
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You can see the rear of a new transmitter-to-antenna 1 KW RF switch with four RG-213 cables leading to it. Below that is an STL receiver and above a Sine remote control. |
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The finished
setup has an MW-1A Transmitter on the left, which is no longer supported by
Harris.
Next is a custom RF filter box to keep a nearby 1360 KHz station out of this
1450 KHz station, and then an equipment rack on the right with a new
Broadcast Electronics
AM1A 1000 Watt Transmitter.
At the top of the rack is a Marti STL-8 Receiver. Below it is a 1 KW RF switch, Sine remote control, audio processing, and the new transmitter. At the very bottom of the rack you can see 3-inch copper strap that has been silver soldered joining all of the equipment for lightning protection. |
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The back of
this new rack-mounted transmitter has coils of cable. On the right are
the power and RF output cables with ferrite cores. The combination of
coiling the cables and the cores is good engineering practice to keep
lighting out of the equipment. Control and metering lines coil twice
through white colored cores on the left in this photo. The project worked out well and the new transmitter passed FCC required occupied bandwidth and RF harmonic tests. |
| March 6, 2011 e-mail: Very nice upgrade there at KBUN. Steve in Green Bay, Wisconsin. |
| Find KBUN/KBHP/KKZY/KLLZ
Radio on the Web at
http://www.paulbunyanbroadcasting.com Their telephone number is 218-444-1500. |
page last edited 05/14/2012
